![Guide to changing Trailblazer / Envoy 4.2L I6 Spark Plugs w/ Images & Google Doc URL | Page 4 | Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum Guide to changing Trailblazer / Envoy 4.2L I6 Spark Plugs w/ Images & Google Doc URL | Page 4 | Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum](http://hbassociates.us/Trailblazer_Plugs_01.jpg)
Guide to changing Trailblazer / Envoy 4.2L I6 Spark Plugs w/ Images & Google Doc URL | Page 4 | Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum
![NGK - NGK-7164-8 | NGK Iridium IX TR-55IX Spark Plugs (.055 GAP) - GM LSx V8 Applications (Set of 8) | Complete Street Performance NGK - NGK-7164-8 | NGK Iridium IX TR-55IX Spark Plugs (.055 GAP) - GM LSx V8 Applications (Set of 8) | Complete Street Performance](https://cdn11.bigcommerce.com/s-jobx3e0qy/images/stencil/1280x1280/products/4578/8462/iridiumix__04088__68643.1542835334.jpg?c=2)
NGK - NGK-7164-8 | NGK Iridium IX TR-55IX Spark Plugs (.055 GAP) - GM LSx V8 Applications (Set of 8) | Complete Street Performance
![NGK - NGK-3951-8 | NGK V-Power TR-55 Spark Plugs (.055 GAP) - GM LSx V8 Applications (Set of 8) | Complete Street Performance NGK - NGK-3951-8 | NGK V-Power TR-55 Spark Plugs (.055 GAP) - GM LSx V8 Applications (Set of 8) | Complete Street Performance](https://cdn11.bigcommerce.com/s-jobx3e0qy/images/stencil/1280x1280/products/4576/8460/vpower__94169__83151.1542835334.jpg?c=2)
NGK - NGK-3951-8 | NGK V-Power TR-55 Spark Plugs (.055 GAP) - GM LSx V8 Applications (Set of 8) | Complete Street Performance
How to change Spark Plugs on a 2004 TB with 4.2l | Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum
![Ignition Systems 6 Champion Platinum Spark Plugs Set for CHEVROLET TRAILBLAZER 2002-2009 L6-4.2L Spark Plugs & Glow Plugs Ignition Systems 6 Champion Platinum Spark Plugs Set for CHEVROLET TRAILBLAZER 2002-2009 L6-4.2L Spark Plugs & Glow Plugs](https://www.sixityauto.com/images/2024107656image1.jpg?refresh)